谁告诉我下面这些单词的复数形式mother this that sister brother parent

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谁告诉我下面这些单词的复数形式
mother this that sister brother parent

mother sister brother parent ,这几个词,变复数直接加s
this复数 these that 复数those

mother these there sister brother parents

mothers,these,thoes,sisters,brothers,parents

mothers these those sisters brother parents